Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine
Fluoro substitution in thermotropic liquid crystals provides a general way of modifying the properties of a parent system. Transition temperatures, mesophase types and other physical properties can be affected by fluoro substitution, so that frequently the behaviors of the parent compound can be man...
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| Format: | Article |
| Language: | English |
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MDPI AG
2013-05-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/3/2/339 |
| _version_ | 1798005439016730624 |
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| author | Chunhung Wu Hsiu-Fu Hsu Yu-Ling Yang Ching-Ting Liao Yamuna Ezhumalai Yi-Hui Lin |
| author_facet | Chunhung Wu Hsiu-Fu Hsu Yu-Ling Yang Ching-Ting Liao Yamuna Ezhumalai Yi-Hui Lin |
| author_sort | Chunhung Wu |
| collection | DOAJ |
| description | Fluoro substitution in thermotropic liquid crystals provides a general way of modifying the properties of a parent system. Transition temperatures, mesophase types and other physical properties can be affected by fluoro substitution, so that frequently the behaviors of the parent compound can be manipulated and improved in a predictable manner. This paper discusses the effects of a fluoro substitution in each side-arm of 1,2,4,5-tetrakis((4-(alkoxy)phenyl)ethynyl)benzenes on the resulting mesomorphic properties characterized by optical polarizing microscopy and differential scanning calorimetry. Without any fluoro-substituted side-arms, longer chain-length leads to a wider nematic temperature range on cooling. Incorporation of a fluoro substitution in each side-arm induces the formation of a lamellar suprastructure, lowers transition temperatures and results in a wider mesophase temperature range on cooling. |
| first_indexed | 2024-04-11T12:39:14Z |
| format | Article |
| id | doaj.art-d65b88fd6f76499b91ea5be65aca2334 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T12:39:14Z |
| publishDate | 2013-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-d65b88fd6f76499b91ea5be65aca23342022-12-22T04:23:33ZengMDPI AGCrystals2073-43522013-05-013233934910.3390/cryst3020339Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-FluorineChunhung WuHsiu-Fu HsuYu-Ling YangChing-Ting LiaoYamuna EzhumalaiYi-Hui LinFluoro substitution in thermotropic liquid crystals provides a general way of modifying the properties of a parent system. Transition temperatures, mesophase types and other physical properties can be affected by fluoro substitution, so that frequently the behaviors of the parent compound can be manipulated and improved in a predictable manner. This paper discusses the effects of a fluoro substitution in each side-arm of 1,2,4,5-tetrakis((4-(alkoxy)phenyl)ethynyl)benzenes on the resulting mesomorphic properties characterized by optical polarizing microscopy and differential scanning calorimetry. Without any fluoro-substituted side-arms, longer chain-length leads to a wider nematic temperature range on cooling. Incorporation of a fluoro substitution in each side-arm induces the formation of a lamellar suprastructure, lowers transition temperatures and results in a wider mesophase temperature range on cooling.http://www.mdpi.com/2073-4352/3/2/3391,2,4,5-tetraalkoxyphenylethynylbenzene (TPEB)cruciform-shapedmesophasesmectic phasenematic phase |
| spellingShingle | Chunhung Wu Hsiu-Fu Hsu Yu-Ling Yang Ching-Ting Liao Yamuna Ezhumalai Yi-Hui Lin Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine Crystals 1,2,4,5-tetraalkoxyphenylethynylbenzene (TPEB) cruciform-shaped mesophase smectic phase nematic phase |
| title | Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine |
| title_full | Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine |
| title_fullStr | Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine |
| title_full_unstemmed | Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine |
| title_short | Influence of Mesogenic Properties of Cruciform-Shaped Liquid Crystals by Incorporating Side-Arms with a Laterally-Substituted-Fluorine |
| title_sort | influence of mesogenic properties of cruciform shaped liquid crystals by incorporating side arms with a laterally substituted fluorine |
| topic | 1,2,4,5-tetraalkoxyphenylethynylbenzene (TPEB) cruciform-shaped mesophase smectic phase nematic phase |
| url | http://www.mdpi.com/2073-4352/3/2/339 |
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